Provenance and age delimitation of Quadrilátero Ferrífero sandstones based on zircon U–Pb isotopes.

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dc.contributor.authorHartmann, Leo Afraneo
dc.contributor.authorEndo, Issamu
dc.contributor.authorSuita, Marcos Tadeu de Freitas
dc.contributor.authorSantos, João Orestes Schneider
dc.contributor.authorFrantz, José Carlos
dc.contributor.authorCarneiro, Maurício Antônio
dc.contributor.authorMcNaughton, Neal Jesse
dc.contributor.authorBarley, Mark E.
dc.date.accessioned2014-11-27T17:50:10Z
dc.date.available2014-11-27T17:50:10Z
dc.date.issued2006
dc.description.abstractThe Quadrilátero Ferrífero has some of the largest iron and gold deposits in the world and is a major geotectonic unit of the São Francisco Craton in Brazil. U–Pb zircon SHRIMP geochronology of six detrital sedimentary and metasedimentary rocks (114 zircon crystals, 118 spot analyses) has improved the understanding of the sedimentary processes and provenance ages of both rocks and the associated iron formation. The age of deposition of the iron formation is constrained between 2.58 and 2.42 Ga. The presence of an old Paleoarchean crust is dated in detrital zircon crystals, including the oldest zircon in South America (3809G3 Ma). Only high-Th/U, magmatic zircon crystals are present in the dated sedimentary rocks, and these indicate that the crust of the region was formed mostly during the Jequie´ cycle (six age peaks between 3055 and 2635 Ma). This time span ofw420 m.y. is similar to the duration of a long-lived Wilson cycle. Most of the Rio das Velhas Basin was filled during approximately 30 m.y. between 2746 and 2717 Ma, though volcanism probably started earlier. The youngest detrital zircon age from the Minas Supergroup indicates that the intracratonic basin fill, including the iron formation, was deposited after 2580 Ma. Therefore, the crust was cratonized shortly after the intrusion of minor granitic bodies at around 2.62–2.58 Ga. A large gap in orogenic activity is indicated by the absence of zircon ages of 2580–2182 Ma.pt_BR
dc.identifier.citationHARTMANN, L. A. et al. Provenance and age delimitation of Quadrilátero Ferrífero sandstones based on zircon U–Pb isotopes. Journal of South American Earth Sciences, v. 20, p. 273-285, 2006. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0895981106000071>. Acesso em: 29 set. 2014.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.jsames.2005.07.015
dc.identifier.issn0895-9811
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4037
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico Journal of South American Earth Sciences concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3478901084962.pt_BR
dc.subjectQuadrilátero Ferríferopt_BR
dc.subjectArcheanpt_BR
dc.subjectGeochronologypt_BR
dc.subjectZirconpt_BR
dc.subjectIron formationpt_BR
dc.titleProvenance and age delimitation of Quadrilátero Ferrífero sandstones based on zircon U–Pb isotopes.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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